Update setup.cfg - Try versions which worked locally on staph for doc building

Author: jtburrows

setup.cfg

@@ -80,11 +80,14 @@ dev =
     pre-commit
     tox
 docs =
-    sphinx ~= 3.5
-    sphinx-autoapi ~= 1.7
-    sphinx_rtd_theme
-    sphinxcontrib-bibtex ~= 2.1
-    nbsphinx
+    sphinx == 3.5.4
+    sphinx-autoapi == 1.9.0
+    sphinx_rtd_theme == 1.3.0
+    sphinxcontrib-bibtex == 2.6.2
+    nbsphinx == 0.9.3
+    jinja2 == 2.11.3
+    markupsafe == 1.1.1
+    docutils == 0.16
 tests =
     pytest
     pytest-cov